Was interested, toward the end of that conversation, to hear my own experiences with #Gmail validated. I've been running my own mail server(s) for 20 years and Gmail is becoming increasing troublesome.
I don't want to just throw up my hands and concede that we're heading towards a world where Google and Microsoft only accept mail from each other.
Does anybody know of a collection of resources tracking the state of play with email? (I'd Google it, but of course search engines are broken now.)